Coil-spring.



No. 736,333. PATENTED AUG. 11, 1903.

V. MEYER.

COIL SPRING. I

APPLICATION FILED DEC. 2, 1902.

I110 menu.

622w WI UNITED ATES" mated August i1, 1903.

VICTOR MEYER, OF HAGEN, GERMANY.

COIL-SPRING.

SPECIFICATION forming part of Letters Patent No. 736,333, dated August 11, 1903.

Application filed December 2,1902. Serial No. 133,606. (No model.)

ToaZZ whom it may concern:

Be it known that I, VICTOR MEYER, civil engineer, a subject of the King of Prussia, German Emperor, residing at Hagen, in the Kingdom of Prussia, German Empire, have invented a certain new and useful Improvement in Coil-Springs, of which the following is a Specification.

This invention relates to the manufacture of One object of my invention is to decrease the dimensions or, more particularly, the diameter of such a spring as much as possible,

. and I- attain that object in general by decreasing the annular spaceor spaces between the two ormore portions of the spring and in particular by einploying the first or innermost portion of the spring as a mandrel for the second or next portion of the same, and this second portion as a mandrel for the third portion, and so on, although my improved spring will generally not consist of more than three portions. Y

Another object of my invention is to pro duce a telescopic spring the portions of which form alternating tension-springs and compression-springs. I attain this object by drawin g the convolutions of the-first and third portions or of the second and fourth portions sufficiently far asunder, after the whole spring has been wound in the aforementioned manner, it being understood that the whole spring is wound of one continuous wire, preferably of quadrangular section. While I describe and illustrate my invention as having the ad- 3' acent series of coils formed integral one with another, it is not necessary that they be integral, butit is sufficient if they be rigidly connected. Therefore I do not produce separate tension springs and separate compressionsprings; but I produce ate-lescopic spring the portions of which are at first not suited either for tensile or for contractile strain and in which the connection between the consecutive portions is perfectly uninterrupted. Only after all the series of convolutions have been wound and the convolutions of alternating series have been drawn asunder and the whole has been hardened, then the telescopic coilspring is finished and complete.

In order to make my invention more clear, I refer to the accompanyin g drawin gs,in which similar letters denote similar parts throughout the several views, and in which-- Figure 1 shows a telescopic spring on a mandrel, the convolutions of one or two of the three series being not yet drawn asunder. Fig. 2 shows the same spring after its completion, and Fig. 8 is an end view of the spring.

In carrying my invention into practice I make use of an ordinary lathe, (not shown,) by means of which an ordinary mandrel, such as a, Fig. 1, is rotated around its axis. The mandrel a is furnished with a driver I), by means of which one end of the wire 0, from which the spring is to be wound, is held in the usual manner. I then wind upon the mandrel a the first series of convolutions, extending, for instance, from c on the left side to c on the right side. I then produce upon series 0 another series, c -that is to say, a series of convolutions extending from c on the right side to c on the left side, the direction of rotation of the mandrel a remaining unchanged, but the wire being guided not from the left to the right, as before, but reversely. If a series more is to be produced I now guide the wire again from the left to the right, producing thereby upon the series 0 a series, 0 extending from c on the left side to c on the right side, and this change of direction of the wire is repeated as often as more series are desired to be produced.

After the desired number of series of the desired number of convolutions has been wound the wire is cut off and all the convolutions allowed to voluntarily expand in consequence of the elasticity of the material,

and owing to this voluntary expansion the ries being continuous one with another, and the convolutions of a portion of the seriesbeing spaced apart.

2. A coil-spring consisting of a plurality of superimposed series of convolutions, the several series being continuous one with another, and the convolutions of alternate series being spaced apart.

In witness whereof I have hereunto set In hand in presence of two witnesses.

VICTOR MEYER.

WVitnesses:

OTTO KoNIG, EMIL BLOMBERG. 

